// Copyright 2017 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the 'License');
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an 'AS IS' BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

precision mediump float;
precision mediump int;

uniform mat4 modelViewMatrix; // optional
uniform mat4 projectionMatrix; // optional
uniform vec3 cameraPosition;
uniform float size;

attribute vec3 position;

varying float zDepth;

void main() {
  gl_PointSize = size;
  gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
  zDepth = distance(position, cameraPosition);
}
